Beingaphysicianwhofliesmuchoften,alotofmytimeisspentonp...

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Being a physician who flies much often, a lot of my time is spent on planes listening for that fearful “Is there a doctor on board?” announcement. I’ve been __21__ only once --- for a woman who had merely fainted(昏厥). But the __22__ made me quite curious about how __23__ this kind of thing happens. I wondered what I would do if __24_ with a real mid-air medical emergency --- without access __25__ a hospital staff and the usual emergency equipment. So __26__ the New England Journal of Medicine last week __27__ a study about in-flight medical events, I read it with __28__.

The study estimated that there are a(n) __29__ of thirty in-flight medical emergencies on U.S. flights every day. Most of them are not __30__; fainting and dizziness are the most frequent complaints. __31__ 13% of them --- roughly four a day --- are serious enough to __32__ a pilot to change course. The most common of the serious emergencies _33__ heart trouble, strokes, and difficult breathing.

Let’s face it: plane rides are __34__. For starters, cabin pressures at high altitudes are set at roughly __35__ they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty_36_, but passengers with heart disease __37__ experience chest pains as a result of the reduced amount of oxygen flowing through their blood. __38__ common in-flight problem is deep venous thrombosis(靜脈血栓) --- the so-called economy class syndrome. __39__ happens, don’t panic. Things are getting better on the in-flight-emergency front. Thanks to more recent laws, flights with at _40__ one attendant are starting to install emergency medical equipment to treat heart attacks.

21. A. addressed B. called C. informed D. surveyed

22. A. affair B. condition C. incident D. disaster

23. A. soon B. long C. often D. many

24. A. provided B. treated C. identified D. faced

25. A. to B. for C. by D. through

26. A. before B. since C. while D. when

27. A. collected B. published C. discovered D. conducted

28. A. patience B. joy C. interest D. sorrow

29. A. average B. amount C. sum D. number

30. A. significant B. serious C. common D. heavy

31. A. For B. Or C. So D. But

32. A. inspire B. require C. engage D. command